The Foreign Policy website has a list of the top 100 public intellectuals from around the world [The Top 100 Public Intellectuals: Bios].
The Canadians are: Malcolm Gladwell, Michael Ignatieff, Steven Pinker, and Charles Taylor. I would have included Irshad Manji, Bob Rae, and Don Cherry.
I included Don Cherry because he would fit right in with David Petraeus who is listed as a top 100 public intellectual.
There are several scientists and people who write about science and religion: Pope Benedict XVI, Noam Chomsky, Richard Dawkins, Daniel Dennett, Jared Diamond, Christopher Hitchens, James Lovelock, Lee Smolin, Harold Varmus, J. Craig Venter, E.O. Wilson. It's interesting that Francis Collins and Ken Miller aren't on the list since the main criterion for inclusion seems to be that the person has written a book and they have Miller & Collins have both written books.
I would have included Richard Lewontin, Bruce Alberts, and David Suzuki. Are there any others who should be on the list? Who should be deleted to make room?
[Hat Tip: Sean at Cosmic Variance]